MIL to be called to yell at me for not being able to afford attendance at a wedding!?

My MIL to be called today to basicly yell at me for me and my fiancee not being able to afford to fly to the East coast to attend a distant family members wedding. The wedding is in VT and we are in CA. The cost just for airfare and hotel accomodations is over $1500 alone! This is not including taking time off work, gift, food and other things while we are there. She told us we were not acting like family. My fiancee has not seen this cousin in over 5 years and has not even spoken to him in 4! I feel that the only reason we even got an invite is because the bride and groom felt obligated because their parents forced them to. FIne and dandy, but we cannot afford to go. Our own wedding is a month later and she is telling us we are horrible a month before our own wedding we are not willing to spend $1500-2000! I am so upset. She has not offered a dime to help us with our wedding, but did not even wink on flying out to this one and is planning on staying out there a week. She too has not seen this person in years and has never even met his bride. I feel she is just trying to go out there to put on a show (if you knew her, you would understand). Should I tell her she is out of line for her repremand or just ignore her. I think if this was even in our budget (wich it is not!) that we would still not attend. In my fiancees own words...."I do not even know them and neither does she!). What do you think I should do about this?